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A107295 Numbers n such that prime(n^2) - n^2 is prime. 0

%I

%S 2,4,12,14,20,42,48,56,60,88,104,120,126,134,138,160,164,182,186,204,

%T 226,254,270,276,312,316,330,336,350,382,408,410,414,422,438,448,450,

%U 480,492,494,502,522,546,568,580,596,620,624,640,650,690,696

%N Numbers n such that prime(n^2) - n^2 is prime.

%e 88 is in the sequence because prime(88^2) - 88^2 = prime(7744) - 7744 = 78977 - 7744 = 71233 = prime(7051).

%t Select[Range[700],PrimeQ[Prime[#^2]-#^2]&] (* _Harvey P. Dale_, Jun 20 2015 *)

%o (PARI) isok(n) = isprime(prime(n^2) - n^2); \\ _Michel Marcus_, Oct 09 2013

%Y Cf. A064269 (prime(n)-n is prime), A141129 (prime(n^2)-n^2).

%K nonn

%O 1,1

%A _Zak Seidov_, May 20 2005

%E More terms from _Michel Marcus_, Oct 09 2013

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Last modified June 13 17:14 EDT 2021. Contains 345008 sequences. (Running on oeis4.)